package jdbc;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

/**
 * 执行关联查询
 */
public class JDBCDemo6 {
    public static void main(String[] args) {
        //需求:王克晶所带班级的信息，列出老师的名字，老师的性别，班级名，所在楼层
        /*
            SELECT t.name,t.gender,c.name,c.floor
            FROM teacher t,class c
            WHERE t.id=c.teacher_id
            AND t.name='王克晶'
            或
            SELECT t.name,t.gender,c.name,c.floor
            FROM teacher t
            JOIN class c ON t.id=c.teacher_id
            WHERE t.name='王克晶'
         */
        try (
                Connection connection = DBUtil.getConnection();
        ){
            Statement statement = connection.createStatement();
            String sql = "SELECT t.name,t.gender,c.name,c.floor " +
                    "FROM teacher t,class c " +
                    "WHERE t.id=c.teacher_id " +
                    "AND t.name='王克晶'";
            ResultSet rs = statement.executeQuery(sql);
            while(rs.next()){
                String tName = rs.getString("t.name");
                String tGender= rs.getString("t.gender");
                String cName = rs.getString("c.name");
                int cFloor = rs.getInt("c.floor");
                System.out.println(tName+"--"+tGender+"--"+cName+"--"+cFloor);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}

